Senior Mendix Developer (f/m/x)

Senior Mendix Developer (f/m/x)

Miejsce pracy: Białystok

Technologies we use

Expected

• Mendix (Low‑Code Platform)
• PostgreSQL
• Oracle Databases

Optional

• Java
• JavaScript
• HTML
• CSS3

About the project

We are looking for a skilled Senior Mendix Developer to join our team and contribute to the design, development, testing, and deployment of enterprise-grade applications using the Mendix low-code platform. You will work in a hybrid environment, collaborating closely with business analysts, architects, testers, and international stakeholders to create innovative solutions that enhance operational efficiency. If you are passionate about low-code development and eager to make a significant impact, this opportunity may be the right fit for you.

Your responsibilities

• Designing and developing enterprise-grade applications using the Mendix low-code platform
• Creating and optimizing domain models, microflows, nanoflows, and intuitive user interfaces
• Implementing integrations with external systems, databases, and third-party APIs using REST, SOAP, and OData
• Converting complex business requirements into functional prototypes and scalable Mendix solutions
• Debugging, troubleshooting, and optimizing application performance to ensure scalability and security
• Implementing workflows and digital solutions that improve operational efficiency
• Developing custom widgets and microservices to extend Mendix functionality
• Conducting unit, integration, and user acceptance testing
• Creating and maintaining technical documentation, including architecture diagrams and deployment guides

Our requirements

• Minimum 4 years of professional IT experience, with at least 2–3 years focused on Mendix development
• Very good knowledge of Mendix Studio Pro and Mendix Cloud services
• Experience with relational databases such as SQL Server, PostgreSQL, or Oracle
• Understanding of microservices architecture and UI/UX principles
• Strong familiarity with Agile/Scrum methodologies and DevOps practices
• Fluent Polish required
• Minimum B1 level of English required

Optional

• Practical knowledge of Java, JavaScript, HTML, and CSS
• Mendix Advanced or Expert certification

This is how we organize our work

This is how we work

• agile
• scrum

What we offer

• Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas
• Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market
• We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022
• Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more
• Comfortable workplace – class A offices or remote work
• Dozens of fascinating projects for prestigious brands from all over the world – you can change them thanks to Job Changer application
• PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers
• Investment in your growth – meetups, webinars, training platform and technology blog – you choose
• Fantastic atmosphere created by all Sii Power People

Recruitment stages

• Send your CV
• Talk to us about your expectations
• Learn more about our projects and choose the best
• Start your adventure with Sii!

Sii Sp. z o.o.

Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment.

Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.